Showing posts with label efp. Show all posts
Showing posts with label efp. Show all posts
3 Mar 2024

137kHz QRSS3 test

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One of the aims for this week is to carry out that 137kHz QRSS3 test with my earth-electrode "antenna" in the ground with my FT817...
11 Apr 2023

E-field probes (EFPs)

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These are tiny receive only antennas that can work extremely effectively at VLF, LF and MF where external noise is usually the dominant fa...
7 Mar 2023

E-field probes (EFP)

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These are very small RX antennas that can be very effective at VLF, LF and MF.  As you move HF, they get less effective. The main issue is t...
4 Oct 2022

E-field probe antennas

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  At VLF, LF and MF, external noise usually is the limiting factor.  Making the RX antenna bigger also increases the noise picked up, meanin...
28 Aug 2022

VLF E-field probe?

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  This photo was taken some years ago. I think it shows my VLF E-field probe.  It is just possible it was the VLF loop pre-amp as they looke...
21 Sept 2021

137kHz tests with an E-field probe mobile

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Before my stroke, I did some mobile tests on 137kHz QRSS QRP using an EFP with an FT817 RX. The EFP was mounted on a mag mount.  Results tot...
12 Aug 2021

Mini-whip RX active antennas

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These antennas can be very effective on VLF, LF and MF. They are extremely small but work every bit as well as big antennas. They are the b...
8 Mar 2021

136kHz E-field probe found

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With a fresh battery, I think this will still work. It was re-found yesterday.  If it does, it means I can do some local tests with my beac...
22 Feb 2021

136kHz experiments

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Before moving to the current QTH about 7.5 years ago, I did some tests on 136kHz QRSS. I used the E-field probe for 136kHz on a mag-mount on...
15 Jan 2021

E-field probes

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There is a common myth that VLF, LF and MF antennas have to be big. Whilst this is true for radiated TX antennas, this is absolutely not tr...
1 comment:
11 May 2020

E-field probes (EFP)

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It is some years since I have tried these antennas. They are RX only and can be very effective at VLF, LF and MF. Some use them on RX up to...
24 Nov 2019

137kHz E-field probe

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Several years ago I made this mag-mounted 137kHz e-field probe to see how far away I could detect my QRPP 137kHz beacon. At about 24km I j...
4 Nov 2019

LF and MF RX

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Over a year ago I bought an E-field probe from PA0RDT . It has still to be erected! In the meantime I have been busy on 472kHz WSPR usin...
13 Jan 2019

Maybe THIS year?

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Looking back over 2018 I see I failed in at least one project aim!  I actually bought the e-field probe, but it has still to be erected. May...
26 Dec 2018

E-field probe RX antennas

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These are RX only antennas, but they can be remarkably successful on VLF, LF and MF. Years ago I made my own, but these days building and e...
10 Sept 2018

E-field probe

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My mini-whip E-field probe has arrived from PA0RDT . It will be some time before this RX antenna can be erected as I depend on help these da...
8 Sept 2018

E-field probe RX antenna

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Years ago, I would have built my own, but these days my fine motor skills are not as good as they once were. So I have bought a PA0RDT mini...
3 comments:
30 Jul 2018

137kHz E-field probe on the car mag-mount

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Many years ago, I tried looking for my tiny 137kHz beacon with a small E-field probe mag-mounted on the car. After seeing the signal quite...
24 Apr 2018

E-field probe RX antennas

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It is a common misconception that big antennas are needed for MF, LF and VLF reception. This not true!! Some very small antennas work ver...
6 Feb 2018

136kHz last night

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There is no doubt that I have to improve my RX system on LF and MF. Last night I spotted the same few stations on 136kHz WSPR and OPERA, g...